172402745 has 8 divisors (see below), whose sum is σ = 211929480. Its totient is φ = 134558080.

The previous prime is 172402723. The next prime is 172402759. The reversal of 172402745 is 547204271.

It can be written as a sum of positive squares in 4 ways, for example, as 28858384 + 143544361 = 5372^2 + 11981^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-172402745 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 420290 + ... + 420699.

It is an arithmetic number, because the mean of its divisors is an integer number (26491185).

Almost surely, 2^172402745 is an apocalyptic number.

It is an amenable number.

172402745 is a deficient number, since it is larger than the sum of its proper divisors (39526735).

172402745 is an equidigital number, since it uses as much as digits as its factorization.

172402745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841035.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 172402745 is about 13130.2225799870. Note that the first 3 decimals coincide. The cubic root of 172402745 is about 556.5635051322.

The spelling of 172402745 in words is "one hundred seventy-two million, four hundred two thousand, seven hundred forty-five".